where, following [1]}, the ghost \(c\)  and antighost \(\bar{c}\)  are
grouped into an \(OSp(2)\)  doublet \(c^\alpha \) , with
\(c^1=c\,,\qquad c^2= \bar{c}\,,\qquad c_1=\bar{c}\,,\qquad c_2=-c\,.\) 
